E-Earning - Your Success or Failure

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How to understand the Domain Name System

Written by Clare Lawrence

How to understandrepparttar Domain Name System By Clare Lawrence 13th August 2004

Ever wonder why DNS systems came into existence? Efficiency. Every computer has a distinct IP address, andrepparttar 108267 Internet needed an elite method for obtaining these addresses and for managingrepparttar 108268 system as a whole. Enter ICANN.

The Internet Corporation for Assigned Names and Number managesrepparttar 108269 DNS root ofrepparttar 108270 Internet domain namespace. ICANNís role is to managerepparttar 108271 assignment of identifiers, ensuring that all users have unique names.

The DNS system is run by a series of servers called DNS servers. ICANN managesrepparttar 108272 root DNS domains, under which arerepparttar 108273 top-level domains. It also manages:

Organizational domains Geographical domains Reverse domains

Beneathrepparttar 108274 top-level domains are other naming authorities such as Nominet,repparttar 108275 UKís naming authority.

How does a DNS Query work?

The process occurs in two parts. Firstly, a name query begins at a client computer and is passed to DNS client service for resolution. Whenrepparttar 108276 query cannot be resolved locally, DNS servers are queried.

For example, when a web browser callsrepparttar 108277 fully qualified domain name www.discountdomainsuk.com,repparttar 108278 request is passed on torepparttar 108279 DNS client service to resolverepparttar 108280 name by using locally cached information. Ifrepparttar 108281 query is held inrepparttar 108282 cache, thenrepparttar 108283 process is complete.

If, however,repparttar 108284 query cannot be answered locally,repparttar 108285 DNS client service uses a server list (ordered in sequence) to query external DNS servers. When a DNS server receives a query, it first checks to see if it is authoritive for that domain name. If it is authoritive, it resolvesrepparttar 108286 name, andrepparttar 108287 process is complete.

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